Cpu-Z can show info about your motherboard, processor, and it pulls the SPD from your ram, telling you what it currently running at, and what it is made from the factory to be ran at, you can get it at http://www.cpuid.com/cpuz.php#download

Also forgot to mention Everest Home Edition, Freeware as all the others, which displays some good information about your system, more then the others do. You can get it here: http://www.lavalys.com/products.php?lang=en